Ensure all binaries we ship for amd64/i386 have built at least once

We historically do not rebuild packages that aren't updated in the archive, but depend on out of archive rebuild tests to show the archive is buildable. Being able to build a package on the current toolchain is essential to post-release support. Particularly since this is an LTS release, this is critical.

The proposal is to rebuild the archive and then remove binaries for any packages that fail. This would ensure that any binaries we ship for Lucid will be from packages that built at least once during the cycle and ought to be reasonably supportable.